For the foundation shown below, determine the effective pressure increase at the middle of the clay layer shown (below the sand layer), 1. by Boussinesq equation 2. by 1:2 method 3. by isobars Note: use SI units (1m=3.28 ft; 1 lb=4.448 N; 1 ton=9.81 kN)

For the foundation shown below, determine the effective pressure increase at the middle of the clay layer shown (below the sand layer), 1. by Boussinesq equation 2. by 1:2 method 3. by isobars Note: use SI units (1m=3.28 ft; 1 lb=4.448 N; 1 ton=9.81 kN)

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter10: Mat Foundations

Section: Chapter Questions

Problem 10.5P

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For the foundation shown below, determine the effective pressure increase at the middle of the clay layer shown (below the sand layer),
1. by Boussinesq equation
2. by 1:2 method
3. by isobars
Note: use Sl units (1m=3.28 ft; 1 Ib=4.448 N; 1 ton=9.81 kN)
50 ton (net load)
Sand
4:5 ft:
y=100 lb/ft?
Groundwater
5 ft X 5 ft
tablė
Sand
3 ft
Yšat=122 lb/ft³.
Ysat =120'lb/ft3:
= 0.7
Č¨= 0.25
C = 0.06
10 ft
Preconsolidation pressure = 2000 lb/ft?

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